Herbert e



(No Model.) 2 She ets'Sh.eet 1.

H. E. HAWES,

MACHINE FOR GRINDING 0R TRUING LATHE CENTERS.

Patented July 12,1892.

I A p 1 n ii A,

I l/VVE/VTOR Mm, 83 mm.

WITNESSES ATTORNEY.

(No Model.) 2 Sheets-Sheet 2.

. H. E. HAWES. MACHINE FOR. GRINDING OR TRUING LATHE CENTERS.

No. 478599. Patented July 12, 1892.

UNITE STATES ATENT OFFICE.

HERBERT E. HAWES, OF BROOKLYN, NEW YORK, ASSIGNOR OF ONE-HALF TO CHARLESH. EDGAR, TRUSTEE, OF SAME PLACE.

MACHINE FOR GRINDING OR TRUING LATHE-CENTERS.

SPECIFICATION forming part of Letters Patent No. 478,599, dated uly 12,1892. Application filed November 20,1891. Serial No. 412,483- (Nomodel.)

To all whom it may concern.-

Be itknown that I, HERBERT E. HAWES, of the city of Brooklyn, county ofKings, and State of New York, have invented a new and useful Improvementin Machines for Grinding or Truing Lathe-Centers, of which the followingis a full, clear, and exact description, reference being had to theaccompanying drawings, in which Figure 1 represents a perspective viewof said mechanism; Fig. 2, aview, partly in side elevation, partly incentral vertical section, and partly broken away to show worm, of partsof Fig. 1, all as hereinafter described; Fig. 3, a cross-section of Fig.2 at line X X; Fig. 4, a general perspective view of my mechamsm.

' The object of myinvention is to grind lathecenters, but particularlythe center used in the dead or tail spindle and so as to obtainautomatically and with comparatively no additional trouble or expense acomplete and exact alignment and coincidence between points and axes ofthe lathe-centers.

Heretofore, as is well known, such centers have been ground to therequired conical shape at their extremities by securing them separatelyin the usual manner in the livespindle socket of the lathe and revolvingthem against a proper grinding-surfacesuch as an emery-wheelthe axis ofwhich during the grinding remained fixed relatively to the axes ofrevolution of the live-spindle. By this former process both centers wereground substantially alike; but on placing the deadspindle center in thedead or tail spindle socket it was found, as a rule, that the pointedextremities of the two spindles did not coincide exactly, neither didtheir axes, nor did the central axes of the dead-center coincide withthe axes around which was rotated the live-spindle and the centercarried thereby. The difficulties of correcting this lack of alignmentand coincidence and the evil results thereof upon the lathe-work arewell understood.

I accomplish the object of my invention by means of the mechanismhereinafter described and illustrated by the drawings.

, d is an ordinary grinding-wheel, having its periphery covered withemery or other suitable grinding-surface. It is fixed upon a hollowarbor or sleeve R and rotated by feather Z of latter engaging inlongitudinal spline or groove m in wheel-shaft e. Wheel-arbor 1trevolves in bearings 1 l, which constitute a part of frame 0, whichslides back and forth upon the guides n 0, rigidly secured to frame b,supported upon base-plate a, fixed to tapered plug S, shaped to fit thesockets S S" in lathe-spindles.

Wheel-arbor R is provided with collar P and threaded nut P, betweenwhich wheel 01 is clamped. These collars and the wheel fill the spacebetween wheel-bearings l 1, and thus prevent longitudinal movement ofarbor R.

Sliding frame O is reciprocated by means of lever g, attached to frame 0by screw-pin 7a or otherwise and by shouldered screw I to gearedworm-wheel f, actuated by worm 7.: on wheel-shaft c, said attachmentbeing so effected as to admit of pin h and screw I turning partially intheir hearings in lever g. The geared worm wheel f rotates upon a fixedcentral bearing-screw J, fixedly secured to projection J upon the frameI). A small corner of projection J only is shown in the drawings, Fig.2, the wheel f concealing it and the dotted line showing the position ofJ Wormwheel f rotates in engaging contact with worm 7.0 on wheel-shafte. The inner end of shaft e, carrying the worm 7c, revolves in suitablehearing or lug b, rigidly secured to frame b. Axes of shaft c, its saidbearing b, and guides n 0 are parallel.

2 2' are lugs secured to frame I; and connecting latter with guides 001, respectively. On shaft 6 is fixed pulley U. Shaft c is held againstendwise movement by head or shoul- 9o der W abutting against bottom andsides of the counter-bore or enlargement of shaft bearing in the lug I),(see Fig. 2,) where a portion of the wall of Z) is broken away to showthe construction.

To enable frame I) to be moved away from or toward the center ofrevolution of the grinding apparatus, plate a is provided with featheror projection X, (see dotted lines in Fig. 2,) fitting intocorresponding groove or depression in plate a, plate and frame beingclamped together by screws 2 z passing through slots, whereby, as willreadily be understood, frame I) with its attached parts maybe movedtoward and away from the center of plug S and secured by tightening thescrews at the distance therefrom desired. Part of plug S nearest toplate Ct is left straight as bearing for double pulley T.

v 'v are a pair of idler-pulleys revolving upon bearing-shaft 4. Thisbearing-shaft 4 is flattened and adjustably clamped to plate a by screw4' sliding in slot extending radially from center of plug i The taperedplug S, being fitted in the usual manner into the socket of thelive-spindle of the lathe, is rotated thereby, and thus thegrinding-wheel cl is caused to revolve in an orbit around the extremityof the lathe-center to be ground thereby, while at the same time thesaid grinding-wheel is caused to rotate upon its own axes follows:Pulleys D D upon a counter-shaft E, secured to tool-post F or otherwisein any convenient manncras, for instance, by means of the frame G-areconnected, the one D with the cone-pulley of the lathe by belt H, theother D with double pulleyT by belt M, (shown in section, Fig. 2,) andthe pulleys U, idler-pulleys o o, and double pulley T are connected byanother belt U, as

. will be readily understood. The rotation of the cone-pulley thusrotates the pulley D", carrying thereby the intermediate shaft E,rotatingin frame G, and thus causes the pulley Dto rotate, which,through the belt M rotates the double pulley T, which in turn, throughthebelt U, causes the idler-pulleys o o to rotate, and also the pulleyU, rotating therewith the wheel-shaft e, whereby the grindingwh-eel clis caused to rotate upon its own axes while it is being simultaneouslyrevolved by i the rotation of the live-spindle of the lathe in an orbitconcentric with the latters axis of rotation.

The operation of my invention is as follows: My grinding mechanismdescribed having been secured, as aforesaid, in the socket of thelive-spindle of the lathe andv the belts and intermediate shaftsadjusted, a lathecenter is secured in the usual Way within the dead ortail spindle socket to be ground on its exposed end to the usual coneshape. The frame I) is then moved and adjusted relatively to the platea, and so as to bring the grinding-edge of the wheel d into the requiredcontact with the end of the lathe-center N, which is to be ground, thelatter being advanced and adjusted by moving the tail-spindle S in theusual manner. The idler-pulleys are also moved and adjusted and fastenedso as to tighten the belt. Power being applied in the usual way to thecone-pulley, the grinding-Wheel d is caused to rotate and revolve, asaforesaid, and is at the same time moved longitudinally back and forthover the surface which is being ground by the sliding of the frame C,which is caused to reciprocate on its guides at o, as aforesaid. By thelatter m ovement a 'cone surface of any desired width may be groundirrespective of the width of the grinding-wheel and undue and unevenwear of the grinding-surface of the wheel is obviated. The rotation ofthe grinding-wheel on its own axis produces the grinding eft'ectrequired, audits revolution in an orbit around .the axis of rotation ofthe live-spindle insures the grinding down of the lathe-center into acone, whose apex and axis are exactly coincident with said axis ofrotation of the livespindle.

To grind or true the lathe-center which cure the plug S in the socket ofthe dead or is to be used in the live-spindle socket, I setail spindle,readjust the belts after moving" the pulley D to the required positionupon the intermediate shaft E, and secure within the socket of the liveor head spindle the center which is to be ground. The latter is ofcourse caused to rotate by the rotation of the live-spindle and thegrinding-wheel being adjusted, as aforesaid, so as to make the requiredcontact is simultaneously rotated and moved backward and forwardlongitudinally, as described, thus effecting the grinding. In

this case,however,it will of course be under-- stood that thegrinding-wheel d does notrevolve, this being rendered unnecessary by therotation of the center which is being ground.

Fig. 4 of the drawings shows the application of my mechanism to anordinary lathe, the grinding mechanism being shown in position withinthe socket of the live-spindle and brought down by adjustment, so as toapply the edge of the grinding-wheel to the extremity of the center N.By means of my said mechanism and method of grinding the centers bothcenters are automatically and necessarily ground so that their apexesWill exactly meet in the very center of the longitudinal axis ofrotation of the live-spindle of the lathe and this irrespective of anybend through defect in the dead-center or deadspindle socket orinaccurate alignment of the lathe-sockets or of the centers themselves.

What I claim as new, and desire to secure by Letters Patent, is thefollowing:

1. The combination of the live-spindle of a lathe with a grinding-wheelrevolving in an orbit concentric with the axes of rotation of saidlive-spindle, substantially as and for the purpose described.

2. The combination of the live-spindle of a lathe with a rotatinggrinding-wheel revolving in an orbit concentric with the axes ofrotation of said live-spindle, substantially as of rotation of saidlive-spindle, substantially as and for the purpose described.

4. The combination, with the live spindle, of

revolvingand rotating grinding-wheel thereby revolved in orbitconcentric with said spindles axis of rotation, substantially as and forthe purpose described.

5. The combination of livelathe-spindle and actuatingpulley T, bothhaving same axis of rotation, and rotating and revolving grindingwheelrevolving in orbit concentric with said axis, substantially as and forthe purpose described.

6. The combination oflivelathe-spiudle and actuating-pulley T, bothhaving same axis of rotation, and rotating, revolving, and reciproeatinggrinding-wheel revolving in orbit concentric with said axis,substantially as and for the purpose described.-

7. The combination of plug S, pulley T, frame I), shaft 6, wheel (1,pulleys v '0, and pulleyU, all connected together substantially as andfor the purpose described.

8. The combination of plug S, pulley T, frame I), shaft e, wheel d,pulleys v v, pulley U, and arbor R, all connected together substantiallyas and for the purpose described.

9. The combination of plug S, pulley T, frame I), shaft e, wheel d,pulleys v '0, pulley U, arborR, bearings 1 1 worm is, worm-wheel f,connecting-rod g, sliding frame 0, spline m,

and feather Z, all connected together substan-' tially as and for thepurpose described.

10. The combination of plug S, pulley T,

frame I), shaft e, wheel 01, pulleys o of, pulley U, arbor R, bearings 11, worm lo, worm-wheel f, and guide-rods n 0, all connected togethersubstantially as and for the purpose described.

11. The combination of plug S, pulley T, frame b, shaft e, worm 7t,worm-wheel f, connecting-rod g, sliding frame 0, and wheel d, and

pulleys o, 1;, and U, substantially as and for the purpose described.

12. The combination of plug S, pulley T, frame I), base-plate a, shafte, pulleys '0 Q) U, and Wheel d, substantially as and for the purposedescribed.

13. The combination of lathe cone-pulley Y, counter-shaft E, pulleys DD, live-spindle S, plug S, pulley T, frame I), shaft 6, and wheel d, allconnected together substantially as and for the purpose described.

14. The combination of lathe cone-pulley Y, counter-shaft E, pulleys DD, live-spindle S, plug S, pulley T, frame I), shaft e, Wheel (1, wormis, worm-Wheel f, connecting-rod g, sliding frame 0, and guides n 0, allconnected together substantially as and for the purpose described.

HERBERT n. HAWES.

Witnesses:

WM. COTTER DICK, WM. .1. WHrrEnoUsE.

